{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSBDS is a highly conserved protein that plays a pivotal role in the late cytoplasmic maturation of the 60S ribosomal subunit. It functions in complex with the GTPase EFL1 to catalyze the eviction of the anti‐association factor eIF6 from nascent 60S subunits, thereby promoting ribosome joining and robust translation. Structural and biochemical studies—including cryo–electron microscopy and kinetic analyses—demonstrate that SBDS directly binds to EFL1, acting in a coordinated, multistep mechanism that ensures proper ribosome assembly and fidelity of protein synthesis. These investigations have established a central function for SBDS in RNA metabolism and translational activation, with gene conversion events and loss‐of‐function mutations underlying the pathogenesis of Shwachman–Diamond syndrome (SDS)."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its foundational role in ribosome biogenesis, SBDS is critical for regulating the translation of specific mRNAs that govern cell growth and differentiation. In hematopoietic progenitors, for example, SBDS deficiency is linked to impaired translation re–initiation of key regulators such as the C/EBP isoforms, which impacts granulocytic differentiation and MYC expression. Furthermore, loss of normal SBDS function has been associated with increased cellular stress, evidenced by reactive oxygen species accumulation and hypersensitivity to apoptotic triggers (including aberrant Fas signaling), as well as defects in telomere maintenance. These studies also indicate that disrupted SBDS activity may impinge on the stabilization of tumor suppressor pathways by altering p53 regulation, thereby contributing to marrow failure and leukemia predisposition observed in SDS."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "16"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nComplementary insights into the structure, intracellular localization and clinical heterogeneity of SBDS further refine our understanding of its multifaceted functions. Molecular genetic studies have revealed a spectrum of SBDS mutations—frequently arising from gene conversion with a nearby pseudogene—that account for the heterogeneous clinical manifestations of SDS, including exocrine pancreatic insufficiency, skeletal dysplasia and bone marrow failure. Detailed analyses of SBDS domains have identified a conserved nucleolar “FYSH” region as critical for RNA binding and proper nucleocytoplasmic trafficking, while studies of mutant proteins using molecular dynamics and live–cell imaging demonstrate that loss of specific structural elements (or mislocalization) disrupts essential protein–protein interactions (such as those with RNF2) and alters downstream signaling cascades. In addition, clinical correlations ranging from atypical immunodeficiency to neonatal skeletal dysplasias underscore the broad impact of SBDS dysfunction on development and stress responsiveness."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Graeme R B Boocock, Jodi A Morrison, Maja Popovic, et al. 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